Methanogenium frigidum explained
Methanogenium frigidum is a psychrophilic, H2-using methanogen from Ace Lake, Antarctica.[1]
Description and metabolism
Cells are psychrophilic, irregular, slightly halophilic and non-motile coccoids (diameter 1.2 to 2.5 μm). They require salt to grow. They prefer low temperatures: their optimal temperature is 15 °C, and they cannot grow at 18 °C–20 °C. They reduce carbon dioxide with hydrogen to produce methane, but it may be possible that they use other substrates as well. One experiment showed that these cells grow best in the presence of yeast extract.[2]
Genome
The genome of this species differs from those of archaea that prefer higher temperatures. It contains more polar amino acids, particularly Gln and Thr, and fewer non-polar ones, particularly Leu. Unlike hyperthermophiles, in psychrophiles, the GC content is the most important factor to the stability of the tRNA.[3]
Further reading
- Saunders. N. F.W.. Mechanisms of Thermal Adaptation Revealed From the Genomes of the Antarctic Archaea Methanogenium frigidum and Methanococcoides burtonii. Genome Research. 13. 7. 2003. 1580–1588. 1088-9051. 10.1101/gr.1180903. 12805271. 403754.
- Book: Falkow, Stanley . Dworkin, Martin . The prokaryotes: a handbook on the biology of bacteria . Springer . Berlin . 2006 . 0-387-25493-5 .
- Garrett, Roger A., and Hans-Peter Klenk, eds. Archaea: evolution, physiology, and molecular biology. Wiley. com, 2008.
External links
Notes and References
- Franzmann. P. D.. Liu. Y.. Balkwill. D. L.. Aldrich. H. C.. Conway De Macario. E.. Boone. D. R.. Methanogenium frigidum sp. nov., a Psychrophilic, H2-Using Methanogen from Ace Lake, Antarctica. International Journal of Systematic Bacteriology. 47. 4. 1997. 1068–1072. 0020-7713. 10.1099/00207713-47-4-1068. 9336907. free.
- Book: Asim K. Bej. Jackie Aislabie. Ronald M. Atlas. Polar Microbiology: The Ecology, Biodiversity and Bioremediation Potential of Microorganisms in Extremely Cold Environments. 978-1420083880. 52–53, 103, 121. CRC Press. 2009. 2016-09-05.
- Saunders, N.F.W.. Thomas, T.. Curmi, P.M.G.. Mattick, J.S.. Kuczek, E.. Slade, R.. Davis, J.. Franzmann, P.D.. Boone, D.. Rusterholtz, K.. Feldman, R.. Gates, C.. Bench, S.. Sowers, K.. Kadner, K.. Aerts, A.. Dehal, P.. Detter, C.. Glavina, T.. Lucas, S.. Richardson, P.. Larimer, F.. Hauser, L.. Land, M.. Cavicchioli, R.. 4. Mechanisms of thermal adaptation revealed from the genomes of the Antarctic Archaea Methanogenium frigidum and Methanococcoides burtonii. 10.1101/Gr.1180903. Genome Research. 2003. 13. 7. 1580–1588. 2016-08-03. 403754. 12805271.
